Tunneling along bottom method of soft thick coal seam

Abstract

The invention discloses a tunneling along the bottom method of a soft thick coal seam. The tunneling along the bottom method is suitable for 5-7 meter thick soft coal seam. The tunneling along the bottom method comprises the following steps that S1, the coal seam is cut along the bottom, and part of the coal seam is reserved at the top of the coal seam; S2, wire meshes beam and anchor cable support are carried out on a cut roadway; S3, slurry is sprayed to protect the roadway; and S4 grouting reinforcement is carried out on the roadway; the cutting along the bottom in the S1 specifically comprises the steps that transverse reciprocating cutting is carried out along the bottom on the coal seam, the part of the coal seam is reserved along the top and two sides from the roadway forming, and the reserved part of the coal seam along the top and two sides is finally vertically tunneled in a small disturbance mode; and the roadway which conforms to the middle waist line of a given roadway section is formed. According to the technical scheme, the problems of roadways of soft middle-thick coal seams are tunneled along bottom plates and reserving top coal, the coal seams are soft, the disturbance resistance is poor, and surrounding rocks are difficult to control are effectively solved. The service life of the roadways is prolonged, the support reliability and the engineering quality areimproved, the repair rate is reduced, and the safe production is effectively guaranteed.

Description

technical field [0001] The invention relates to coal mining, in particular to a method for tunneling along the bottom of a soft and thick coal seam. Background technique [0002] According to the coal seam occurrence characteristics, there are a large number of coal seams with a thickness of 5m-7m in my country's coal resources. During the excavation process of this type of coal seam, if the tunnel is excavated along the top and bottom, the height of the two roadways will be too large, and the difficulty of roadway surrounding rock control will increase. , which is not conducive to safe production; if tunneling along the roof and the bottom coal is excavated, during fully mechanized caving mining, the mining links such as end treatment and advance support of the working face are more complicated, which is not conducive to safe production; tunneling along the floor and the top coal is harmful to safety. High-efficiency mining work is the most favorable layout method, but due to...

AI Technical Summary

Problems solved by technology

[0002] According to the characteristics of coal seam occurrence, there are a large number of coal seams with a thickness of 5m-7m in my country's coal resources. During the excavation process of this type of coal seam, if it is excavated along the top and bottom, the height of the two roadways will be too large, and the difficulty of roadway surrounding rock control will increase. , which is not conducive to safe production; if tunneling along the roof and the bottom coal is excavated, the mining links such as the end treatment of the working face and advanced support are more complicated, which is not conducive to safe production; the tunneling along the floor and the top coal is harmful to safety. High-efficiency mining is the most favorable layout method, but due to the soft coal seam, poor anti-disturbance ability and difficult control of surrounding rock, it has always been one of the main problems plaguing the production of the industry

[0003] "A Large Chamber Excavation Method (200910237883.7)" is not applicable and soft, joints and fissures are developed in coal seam roadway excavation, which is not conducive to the maintenance of the roadway surrounding rock, and there is no self-grouting reinforcement for the surrounding rock

However, "Excavation Method for Coal Seam Roadway with Hard Gangue (201710669048.5)" is not applicable to coal seam roadway excavation with soft and soft joints and cracks, and the excavation disturbance is relatively large, which is not conducive to the maintenance of the roadway surrounding rock, and there is no self-grouting for the surrounding rock Reinforcement measures are not conducive to safe production

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